This extension is an interface to the GNU implementation as a library of the Basic Calculator utility by Philip Nelson; hence the name.| CARVIEW |
Select Language
HTTP/2 301
server: myracloud
date: Fri, 26 Dec 2025 13:26:35 GMT
content-type: text/html
content-length: 161
location: https://www.php.net/bcmath
HTTP/2 200
server: myracloud
date: Fri, 26 Dec 2025 13:26:35 GMT
content-type: text/html; charset=utf-8
content-language: en
permissions-policy: interest-cohort=()
x-frame-options: SAMEORIGIN
status: 200 OK
link: ; rel=shorturl
last-modified: Fri, 26 Dec 2025 12:08:24 GMT
vary: accept-encoding
content-encoding: gzip
expires: Fri, 26 Dec 2025 13:26:35 GMT
cache-control: max-age=0
PHP: BC Math - Manual
BCMath Arbitrary Precision Mathematics
- Introduction
- Installing/Configuring
- BC Math Functions
- bcadd — Add two arbitrary precision numbers
- bcceil — Round up arbitrary precision number
- bccomp — Compare two arbitrary precision numbers
- bcdiv — Divide two arbitrary precision numbers
- bcdivmod — Get the quotient and modulus of an arbitrary precision number
- bcfloor — Round down arbitrary precision number
- bcmod — Get modulus of an arbitrary precision number
- bcmul — Multiply two arbitrary precision numbers
- bcpow — Raise an arbitrary precision number to another
- bcpowmod — Raise an arbitrary precision number to another, reduced by a specified modulus
- bcround — Round arbitrary precision number
- bcscale — Set or get default scale parameter for all bc math functions
- bcsqrt — Get the square root of an arbitrary precision number
- bcsub — Subtract one arbitrary precision number from another
- BcMath\Number — The BcMath\Number class
- BcMath\Number::add — Adds an arbitrary precision number
- BcMath\Number::ceil — Rounds up an arbitrary precision number
- BcMath\Number::compare — Compares two arbitrary precision numbers
- BcMath\Number::__construct — Creates a BcMath\Number object
- BcMath\Number::div — Divides by an arbitrary precision number
- BcMath\Number::divmod — Gets the quotient and modulus of an arbitrary precision number
- BcMath\Number::floor — Rounds down an arbitrary precision number
- BcMath\Number::mod — Gets the modulus of an arbitrary precision number
- BcMath\Number::mul — Multiplies an arbitrary precision number
- BcMath\Number::pow — Raises an arbitrary precision number
- BcMath\Number::powmod — Raises an arbitrary precision number, reduced by a specified modulus
- BcMath\Number::round — Rounds an arbitrary precision number
- BcMath\Number::__serialize — Serializes a BcMath\Number object
- BcMath\Number::sqrt — Gets the square root of an arbitrary precision number
- BcMath\Number::sub — Subtracts an arbitrary precision number
- BcMath\Number::__toString — Converts BcMath\Number to string
- BcMath\Number::__unserialize — Deserializes a data parameter into a BcMath\Number object
＋add a note
User Contributed Notes 3 notes
Hayley Watson ¶
10 years ago
volek at adamv dot cz ¶
10 years ago
Note that when you use implementation of factorial that ClaudiuS made, you get results even if you try to calculate factorial of number that you normally can't, e.g. 2.5, -2, etc. Here is safer implementation:
<?php
/**
* Calculates a factorial of given number.
* @param string|int $num
* @throws InvalidArgumentException
* @return string
*/
function bcfact($num)
{
if (!filter_var($num, FILTER_VALIDATE_INT) || $num <= 0) {
throw new InvalidArgumentException(sprintf('Argument must be natural number, "%s" given.', $num));
}
for ($result = '1'; $num > 0; $num--) {
$result = bcmul($result, $num);
}
return $result;
}
?>
ClaudiuS ¶
12 years ago
Needed to compute some permutations and found the BC extension great but poor on functions, so untill this gets implemented here's the factorial function:
<?php
/* BC FACTORIAL
* n! = n * (n-1) * (n-2) .. 1 [eg. 5! = 5 * 4 * 3 * 2 * 1 = 120]
*/
function bcfact($n){
$factorial=$n;
while (--$n>1) $factorial=bcmul($factorial,$n);
return $factorial;
}
print bcfact(50);
//30414093201713378043612608166064768844377641568960512000000000000
?>
↑ and ↓ to navigate •
Enter to select •
Esc to close • / to open
Press Enter without
selection to search using Google